文献1（2017）：Study on Protection Mechanism of 30CrMnMo-UHMWPE Composite Armor（30CrMnMo-UHMWPE复合装甲防护机理研究）

The node velocities and the element equivalent plastic strain in various parts（see Figure 6）are plotted to reveal the relationship between the velocity and the deformation in different parts of the projectile. These velocities at a typical time of 6 μs are plotted along a local coordinate, which describes the distance from the tail to the nose along the medial axis of the projectile. Owing to erosion during penetration, the length of the projectile is reduced to 35 mm. The plastic strain is zero for lengths of 0-22 mm, indicating that only elastic deformation occurs and, hence, the high initial values（-1798 m/s） of the node velocities are maintained. Owing to the elastic waves, however, the velocity fluctuates significantly near the nose. Furthermore, at projectile lengths of 22-35 mm, the equivalent plastic strain values of the projectile elements increase gradually from 0.006， and the speed of the corresponding nodes decreases significantly. The velocity of the nose decreases to a minimum of 784 m/s when the plastic strain reaches a maximum of 1.71. In stage I, the low-velocity regions correspond closely to the plastically deformed regions in the nose of the projectile.

Figure.6. Simulation results at 6 us.（a）Contours of equivalent plastic strain；and（b） node velocities d the corresponding element equivalent plastic strains.

The internal energy and mass loss of the steel and PE laminate are plotted for times ranging from 0 to 60μs, to determine the energy absorption of each layer during the projectile-target interactions. When the fragment penetrates the steel plate, the internal energy of the plate increases from zero reaching a maximum of 0.82 kJ at 13μs, decreases to 0.69 kJ at 18μs, and remains approximately constant thereafter. The subsequent constant mass loss shows that the plate stops the absorption of kinetic energy. Before the projectile reaches the PE laminate, the internal energy of the laminate increases continuously, reaching a maximum value (1.43 kJ) at 60μs. This value accounts for 68% of the total energy absorption of the target armor. Therefore, the PE laminate in the composite-structure armor plays an important role in the absorption of projectile kinetic energy during the penetration process.

Figure.9. Internal energy and mass loss of the steel and PE laminate for times ranging from 0 to 60μs.

Study on Protection Mechanism of 30CrMnMo-UHMWPE Composite Armor

Materials 2017 10(4):405-

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